{"id":"CVE-2026-92956","published":"2026-09-17T14:18:01.640","lastModified":"2026-09-17T20:18:59.730","description":"vm2 versions 3.10.1 through 3.11.6 contain a sandbox escape reachable from a default `new VM()` sandbox when running on Node.js 26. WebAssembly.compileStreaming and WebAssembly.instantiateStreaming can produce a raw host-realm Promise that rejects with a host-realm error object; by controlling Symbol.species via Promise.prototype.finally, sandbox code receives that raw host error, walks from the host error constructor to the host Function constructor, and recovers the real host `process` object, gaining host Node.js capabilities (e.g. access to host modules such as fs) in the context of the process running the sandbox. No NodeVM, require permission, host object injection, or otherwise unsafe configuration is required. This is a bypass of the fix for GHSA-6j2x-vhqr-qr7q, which removed the JSPI entry points WebAssembly.promising and WebAssembly.Suspending. The issue is fixed in 3.11.7.","cvssScore":10,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-693"],"vendors":[],"products":[],"references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-wjwh-qqvp-g4p4","tags":[]},{"url":"https://www.vulncheck.com/advisories/vm2-3.10.1-through-3.11.6-sandbox-escape-via-webassembly-compilestreaming","tags":[]}],"exploitRefs":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-wjwh-qqvp-g4p4","tags":[]}],"hasPoc":true,"ai":{"summary":"This flaw allows sandbox escape via WebAssembly, enabling access to host Node.js capabilities within a sandboxed environment. It is critical due to the potential for full host system compromise.","exploitability":"Exploitation is relatively straightforward as it requires running a specific WebAssembly code in a default sandbox setup. No additional permissions or configurations are needed.","blast_radius":"If exploited, this can lead to full compromise of the host system, including access to sensitive files and modules like fs.","remediation":"Upgrade to vm2 version 3.11.7 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","web","vm2","nodejs","wasm","sandbox"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-27T08:55:30.887Z"}}